// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements.  See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License.  You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Package storagemem implements an in-memory storage Bucket.
package storagemem

import (
	"errors"

	"github.com/apache/dubbo-kubernetes/pkg/bufman/pkg/storage"
	"github.com/apache/dubbo-kubernetes/pkg/bufman/pkg/storage/storagemem/internal"
	"github.com/apache/dubbo-kubernetes/pkg/bufman/pkg/storage/storageutil"
)

var errDuplicatePath = errors.New("duplicate path")

// NewReadWriteBucket returns a new in-memory ReadWriteBucket.
func NewReadWriteBucket() storage.ReadWriteBucket {
	return newBucket(nil)
}

// NewReadBucket returns a new ReadBucket.
func NewReadBucket(pathToData map[string][]byte) (storage.ReadBucket, error) {
	pathToImmutableObject := make(map[string]*internal.ImmutableObject, len(pathToData))
	for path, data := range pathToData {
		path, err := storageutil.ValidatePath(path)
		if err != nil {
			return nil, err
		}
		// This could happen if two paths normalize to the same path.
		if _, ok := pathToImmutableObject[path]; ok {
			return nil, errDuplicatePath
		}
		pathToImmutableObject[path] = internal.NewImmutableObject(path, "", data)
	}
	return newBucket(pathToImmutableObject), nil
}
